Trouble Shooting - Mitsubishi Electric CITY MULTI PDFY Series Technical & Service Manual

7

TROUBLE SHOOTING

7-1. How to check the parts
Parts name
Room temparature Disconnect the connector, then measure the resistance using a tester.
thermistor
(Sorrounding temperature 10˚C~30˚C[50˚F~86˚F])
(TH21)
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Transformer Disconnect the connector and measure the resistance using a tester.
CNT T CN3T
Red Blue
1 1
2 2
3 3
Blue
White
Linear expansion Disconnect the connector then measure the resistance valve using a tester.
Refer to the next page for a detail.
valve
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Fan motor
PDFY
Relay connector
P06~30NMU-E
1
2
Protector
PDFY
Relay connector
P36·48NMU-E
Orange
Black
Blue
Yellow
Yellow
Red
Yellow
Gray
C
Gray
Gray
White
Protector
Normal
4.3kΩ ~9.6kΩ Open or short
Normal
CNT(1)-(3)
App.45Ω
CN3T(1)-(3) App.1Ω
Normal
(1)-(5) (2)-(6)
White-Red Yellow-Blown
150Ω
Measure the resistance between the terminals using a tester.
Orange
1
Relay connector
Black
2
4
Gray
4
Measure the resistance between the terminals using a tester.
4
Relay connector
4
4
2
2
1
1
Check points
Abnormal
(Refer to the thermistor)
Abnormal
Open or short
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
±10%
Motor terminal
Normal
or
10,16 24~32
Orange-Gray 43.1Ω
Brack-Gray
53.6Ω
Motor terminal
Normal
or
40
Gray-Orange
23.5Ω
Orange-Black 4.79Ω
Black-Blue 6.78Ω
Blue-Yellow 13.77Ω
Yellow-Red 29.8Ω
Abnormal
Open or short
Abnormal
40.5Ω
Open or short
48.8Ω
Abnormal
48
16.45Ω
8.30Ω
1.454Ω
Open or short
7.94Ω
21.9Ω
(at 20˚C[68˚F])
(at 20˚C[68˚F])
13